US3616868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-actuated impact tool and anvil device having variable choke
Assignee: RAND ENGINEERING CORP
•
Filing: 1970-01-13
•
Granted: 1971-11-02
•
Expires: 1990-01-13
Abstract
Abstract The specification discloses a fluid-operated impact-drilling device in which a hammer is reciprocally mounted in a casing and is adapted for impacting on the upper end of an anvil-bit device mounted in the end of the casing. A continuous supply of pressure medium is introduced into the casing on the opposite side of the hammer from the anvil-bit device and any valve arrangement is provided for cyclically varying the pressure acting on opposite ends of the hammer to cause the hammer to reciprocate in the casing. A particular feature of the valve arrangement is a variable choke valve mounted in the hammer end of the anvil-bit device and arranged to offer greater restriction to flow through the anvil-bit device during retracting movement of the hammer and a lesser restriction of flow during advancing movement of the hammer. The anvil-bit device may comprise a conventional bit on the outer end or it may comprise a ball-like bit member rotatable on an inclined shaft connected to the anvil-bit device.
Inventors
- 👤 Grey Bassinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:30
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14; E21B10/00
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
245 words
In a fluid-operated percussion drill motor: a housing, an anvil mounted in one end of said housing and having an inner end, a hammer reciprocally mounted in said housing for advancing toward said anvil and retracting away from said anvil and having one end adapted for beating on said inner end of said anvil at the end of the advance of said hammer, a first chamber in said housing confined between said one end of said hammer and said inner end of said anvil, means forming a second chamber in said housing at the other end of said hammer, first passage means interconnecting said chambers, second passage means leading from said inner end of said anvil to the atmosphere, means for effecting the continuous supply of fluid under pressure to said second chamber, first valve means controlling said first passage means and operable during retraction of said hammer for restricting said first passage means and operable during advancing of said hammer for opening said first passage means, second valve means controlling said second passage means and mounted therein near the inner end of said anvil, second valve means being in the form of a choke valve having a first condition of lesser restriction and a second condition of greater restriction, and means responsive to a predetermined rate of flow of fluid from said first chamber into said second passage means for adjusting said choke valve from its said first condition to its said second condition.
Claim 2
Dependent Claim
245 words
In a fluid-operated percussion drill motor: a housing, an anvil mounted in one end of said housing and having an inner end, a hammer reciprocally mounted in said housing for advancing toward said anvil and retracting away from said anvil and having one end adapted for beating on said inner end of said anvil at the end of the advance of said hammer, a first chamber in said housing confined between said one end of said hammer and said inner end of said anvil, means forming a second chamber in said housing at the other end of said hammer, first passage means interconnecting said chambers, second passage means leading from said inner end of said anvil to the atmosphere, means for effecting the continuous supply of fluid under pressure to said second chamber, first valve means controlling said first passage means and operable during retraction of said hammer for restricting said first passage means and operable during advancing of said hammer for opening said first passage means, second valve means controlling said second passage means and mounted therein near the inner end of said anvil, second valve means being in the form of a choke valve having a first condition of lesser restriction and a second condition of greater restriction, and means responsive to a predetermined rate of flow of fluid from said first chamber into said second passage means for adjusting said choke valve from its said first condition to its said second condition.
Claim 3
Dependent Claim
23 words
A fluid-operated percussion drill motor according to claim 1, in which said anvil is reciprocally mounted in said one end of said housing.
Claim 4
Dependent Claim
27 words
A fluid-operated percussion drill motor according to claim 1, in which said one end of said hammer has a larger effective area than the other end thereof.
Claim 5
Dependent Claim
27 words
A fluid-operated percussion drill motor according to claim 3 in which said first passage means is in the form of an axial bore extending through said hammer.
Claim 6
Dependent Claim
22 words
A fluid-operated percussion drill motor according to claim 2 which included bit means carried by said anvil on the outer end thereof.
Claim 7
Dependent Claim
41 words
A fluid-operated percussion drill motor according to claim 5 in which said second passage means extends axially through said anvil and through said bit means whereby fluid from said second passage means blows chips and dust away from said bit means.
Claim 8
Dependent Claim
19 words
A fluid-operated percussion drill motor according to claim 5 in which said bit means is rotatable on said anvil.
Claim 9
Dependent Claim
35 words
A fluid-operated percussion drill motor according to claim 7 in which said anvil comprises a shaft projecting from the outer end thereof at an angle, and said bit means is rotatably mounted on said shaft.
Claim 10
Dependent Claim
21 words
A fluid-operated percussion drill motor according to claim 8 in which said bit means is in the form of a sphere.
Claim 11
Dependent Claim
37 words
A fluid-operated percussion drill motor according to claim 9 in which said bit means comprises a spherical body, and rods of hard wear-resistant material distributed on said body and extending radially into and fixed to said body.
Claim 12
Dependent Claim
37 words
A fluid operated percussion drill motor according to claim 1 which includes means responsive to reduction in pressure in said first chamber for adjusting Said choke valve from its said second condition to its said first condition.
Claim 13
Dependent Claim
138 words
A fluid-operated percussion drill motor according to claim 1 in which said second valve means comprises a valve member reciprocal in said second passage means near said inner end of said anvil and having an apertured wall at the end facing said hammer, an annular member stationary in said anvil, said valve member having a first outer position wherein the apertures in said wall are substantially unrestricted and a second inner position wherein at least some of said apertures are restricted by the end of said annular member, biasing means biasing said valve member toward its said first position, said apertures being of such a size that operation of said first valve means to change the rate of fluid flow to said first chamber will effect movement of said valve member between its said first and second positions.
Claim 14
Dependent Claim
21 words
A fluid-operated percussion drill motor according to claim 12 in which said biasing means is in the form of a spring.
Claim 15
Dependent Claim
24 words
A fluid-operated percussion drill motor according to claim 12 in which said biasing means is in the form of a trapped body of fluid.
Claim 16
Dependent Claim
115 words
A fluid-operated percussion drill motor according to claim 1 in which said second valve means is in the form of a coiled spring, said coiled spring having a first extended position wherein at least some of the convolutions thereof are spaced apart for flow of fluid therethrough and a second position wherein at least some of said spaced convolutions are closed on each other to confine the flow of fluid to axial flow through said spring, said spring having one end opening into said second passage means and the other end opening into said first chamber, and the outer periphery of said spring communicating with one only of said first chamber and second passage means.
Claim 17
Dependent Claim
16 words
A fluid-operated percussion drill motor according to claim 15 in which said coiled spring is tapered.
Claim 18
Dependent Claim
23 words
A fluid-operated percussion drill motor according to claim 16 in which the larger end of said spring opens into said second passage means.
Claim 19
Dependent Claim
23 words
A fluid-operated percussion drill motor according to claim 17 which includes means forming a fixed restriction in the smaller end of said spring.
Claim 20
Dependent Claim
16 words
A fluid-operated percussion drill motor according to claim 15 which includes means for preloading said spring.
Claim 21
Dependent Claim
32 words
A fluid-operated percussion drill motor according to claim 15 in which said spring is formed of flat stock with the major axis of said stock perpendicular to the axis of the spring.
Claim 22
Dependent Claim
149 words
An anvil device for use in a percussion drilling tool and adapted for being mounted in one end of the casing of the tool so as to have an inner end inside the casing and adapted for being impacted by a hammer reciprocally mounted in said casing, said anvil having a passage leading therethrough to the atmosphere from said inner end, the improvement which comprises: a choke valve mounted in said passage near said inner end of said tool and having a first condition of lesser restriction of fluid flow into said passage from said casing and a second condition of greater restriction of fluid flow from said casing into said passage, means normally biasing said choke valve toward its said first condition, and means responsive to a predetermined rate of fluid flow from said casing into said passage for adjusting said choke valve into its said second condition.
Claim 23
Dependent Claim
149 words
An anvil device for use in a percussion drilling tool and adapted for being mounted in one end of the casing of the tool so as to have an inner end inside the casing and adapted for being impacted by a hammer reciprocally mounted in said casing, said anvil having a passage leading therethrough to the atmosphere from said inner end, the improvement which comprises: a choke valve mounted in said passage near said inner end of said tool and having a first condition of lesser restriction of fluid flow into said passage from said casing and a second condition of greater restriction of fluid flow from said casing into said passage, means normally biasing said choke valve toward its said first condition, and means responsive to a predetermined rate of fluid flow from said casing into said passage for adjusting said choke valve into its said second condition.
Claim 24
Dependent Claim
110 words
An anvil device according to claim 21 in which said choke valve is in the form of an apertured member, means biasing said apertured member outwardly in said passage toward said inner end of said anvil device, means carried by said anvil device and located in said passage in position to restrict at least some of the apertures in said member when the member is moved inwardly in said second passage away from the said inner end of said anvil device, said member being moveable inwardly in said passage in response to a predetermined rate of fluid flow into said passage from the said inner end of said anvil device.
Claim 25
Dependent Claim
25 words
An anvil device according to claim 22 in which said means biasing said apertured member is in the form of a trapped body of fluid.
Claim 26
Dependent Claim
61 words
An anvil device according to claim 23 in which said coiled spring is a spiral spring having its larger end opening directly into said passage and its smaller end adjacent the inner end of said anvil device, means restricting the flow of fluid into the inner end of said coiled spring, and means for retaining said coiled spring in said passage.
Claim 27
Dependent Claim
26 words
An anvil device according to claim 24 in which said passage adjacent said inner end of said anvil device is enlarged for receiving said coiled spring.
Claim 28
Dependent Claim
22 words
An anvil device according to claim 21 in which said means biasing said apertured member is in the form of a spring.
Claim 29
Dependent Claim
117 words
An anvil device according to claim 21 in which said choke valve is in the form of a coiled spring having an extended position wherein at least some of the convolutions of the spring are spaced from each other and having a collapsed position wherein at least some of said spaced convolutions are closed on each other, means restricting one end of said coiled spring to limit the flow of fluid axially therethrough, one end of said spring opening directly into said passage and the other end of said spring opening into said casing, and the outer peripheral portion of said spring communicating directly with one only of said second passage and the inside of said casing.
Claim 30
Dependent Claim
16 words
An anvil device according to claim 21 which includes bit means on the outer end thereof.
Claim 31
Dependent Claim
22 words
An anvil device according to claim 28 in which said bit means is rotatable on an inclined axis on said anvil device.
Claim 32
Dependent Claim
25 words
An anvil device according to claim 29 in which said bit means is ball-like and has hard wear-resistant inserts distributed thereover and projecting radially therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |